<template>
  <!-- 增加了退出按钮，点击时清空token，并返回到登录页面 -->
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img class="headerimg" src="../assets/bus.png" alt="" height="60px" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主题区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ?'64px' : '200px'">
        <!-- 侧边栏菜单区域 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          background-color="#3e4352"
          text-color="#fff"
          active-text-color="#409EFF"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active='activePath'>
        
          <!-- unique-opened一次只打开一个侧边栏，当打开其他的另一个自动恢复
          unique-opened=“true” -->
          <!-- active-text-color激活的文本颜色 -->
          <!-- :router="true"为每一个侧边栏设置路由跳转 -->
       <!-- :default-active='activePath' 点击得出侧边栏高亮，动态绑定，-->
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一级菜单模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 内容 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/'+subItem.path + ''"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/'+subItem.path)"
            >
            <!--  @click="saveNavState('/'+subItem.path)点击的是哪个状态栏就把他的路径名保存到session中 -->
              <!-- 二 级菜单模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-s-ticket"></i>
                <!-- 内容 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据(获取的菜单数据放到menulist中)
      menulist: [],
      iconsObj: {
        125: "iconfont icon-user",
        103: "iconfont icon-tijikongjian",
        101: "iconfont icon-shangpin",
        102: "iconfont icon-danju",
        145: "iconfont icon-baobiao",
      },
      // 是否折叠
      isCollapse:false,
      // 存放被激活的链接地址
      activePath:''
    };
  },
  // 生命周期函数，调所有的左侧菜单
  // 组件被创建就会执行created生命周期函数
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    // 获取所有菜单
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menulist = res.data;
      console.log(res);
    },
    // 点击按钮，切换菜单的收缩
    toggleCollapse(){
        this.isCollapse=!this.isCollapse
    },
    // 保存链接的激活状态,点击的是哪个状态栏就把他的路径名保存到session中
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath=activePath
    }
  },

};
</script>

<style  scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
}
.el-header>div {
  display: flex;
  align-items: center;
}
span {
  margin-left: 15px;
}

.headerimg {
  border-radius: 50%;
}
.el-aside {
  background-color: #3e4352;
  transition: width 0.5s;
}
.el-menu {
  border-right: none;
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>